28681641 has 16 divisors (see below), whose sum is σ = 42595200. Its totient is φ = 19074384.

The previous prime is 28681633. The next prime is 28681649. The reversal of 28681641 is 14618682.

28681641 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 1 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (28681633) and next prime (28681649).

It is not a de Polignac number, because 28681641 - 2³ = 28681633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28681596 and 28681605.

It is not an unprimeable number, because it can be changed into a prime (28681649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12700 + ... + 14786.

It is an arithmetic number, because the mean of its divisors is an integer number (2662200).

Almost surely, 2^28681641 is an apocalyptic number.

It is an amenable number.

28681641 is a deficient number, since it is larger than the sum of its proper divisors (13913559).

28681641 is a wasteful number, since it uses less digits than its factorization.

28681641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605 (or 2599 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 28681641 is about 5355.5243440769. The cubic root of 28681641 is about 306.1032907741.

The spelling of 28681641 in words is "twenty-eight million, six hundred eighty-one thousand, six hundred forty-one".